Lock tumbler



F. E. BEST 'LQCK TUMBLER original Filed Jan. 8, 1942 INVENTOR.

April 27, 1948.

Patented Apr. 27, 1948 UNITED STTES TENT OFFICE Original applicationJanuary 8, 1942, Serial No. 425,952. Divided and this applicationJanuary 15, 1945, Serial No. 572,904

10 Claims.

Nature and objects Description This and other objects are attained bythe tumbler set forth in the accompanying drawing in which:

Fig. 1 shows a cross-sectional view of such a tumbler in its normalsetting in a lock such as the .aforesaid unpickable lock of reference,as taken on line l--l, Fig. 2.

Fig. 2 is a cross-section of the tumbler only as taken on line 2-2 ofFig. 1.

This tumbler i is of the fiat ring type, preferably provided with acontinuous cylindrical exterior II and a partial cylindrical interior l2concentric therewith adapted to sliding adjustment on lock core parts I!and I8 and having an inwardly extending inverted stair-step-likekey-bit-engaging portion l3 having steps I 4 representing thecombination increments thereof.

These steps preferably have concentric runs, 26, and risers 21 that areof congruent angles adapted to form fit a key bit It as shown. All runsare preferably of the same angular extension.

This stair-step section is terminated by a line l6 that is preferably ofan angle congruent with those of the aforedescribed risers, and that isadapted to abut a mating lock core part l1.

Diametrically opposite said stair-step-section is an inwardly projectingcombination-notch section l9 bounded on the inside by a cylindricalsurface 20 substantially concentric with the exterior surface I I, andterminal lines 28 and 29.

This combination notch section is of greater angular extension than saidstair-step section bounded by diametrical lines t l-2| and 22-22 asshown, and is adapted to receive a number of combination notches ofdifferent depths such as the deep notch 23 and the shallow notch 24. Anynumber of both types of notches preferably up to It! may be providedwithin the space between the two said notches shown which are in theextreme positions.

These notches are provided to accommodate a locking bar 25 of the coreand are angularly spaced in conformity to its angular position inrelation to the respective stair steps [4.

The shallow notch represents a lock operating and control notch while adeep notch represents a lock operating notch only.

It is obvious that modifications may be resorted to in the practicalproduction of the said tumblers. For instance, corners may be roundedand the outer cylindrical surface serrated, etc., so long as theessential elements required for practical operation are observed.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States of America, is:

l. A look tumbler comprising a fiat ring having inwardly extending,key-bit-engaging steps and an inwardly extending portion adapted to havecombination notches cut therein.

2. A look tumbler comprising a fiat ring having centerwardly extendingkey-bit-engaging' steps and a centerwardly extending arcuate sectionhaving a number of combination notches in the said arcuate sectionthereof. I

3. A look tumbler comprising a cylindrical rin having inwardly extendingkey-bit-engaging steps and an inwardly extending arcuate section adaptedto have. combination notches cut therein.

4. A look tumbler comprising a practically fiat ring having inwardlyextending key-bit-engaging stepped section and an oppositely disposedinwardly-extending notch accommodating section adapted to have a numberof combination notches out therein.

5. A lock tumbler comprising a practically flat ring having acenterwardly-extending key-bitengaging stepped section and an oppositelydisposed centerwardly-extending combination notch section having anumber of permuted combination notches therein of a number of depths.

6. A look tumbler comprising a flat ring having an inwardly-extending,key-bit-engaging stepped section and an oppositely disposedinwardly-extending combination notch section having a number ofdifierently oriented combination notches cut therein.

'7. A combinated lock tumbler comprising a flat ring, having apractically unbroken circular outer. edge and having combinationconfigurations and key-bit-engaging steps on its inner edge.

8. A look tumbler comprising a flat, concentric ring having apractically unbroken outer edge and having inwardly-extending,key-bit-engaging steps and an inwardly-extending notch section,concentric with said ring, said notch section having a number ofvariously oriented combination notches of a, variety of radial depthsformed in the inner edge thereof.

9. A lock tumbler comprising a cylindrical ring having a practicallyunbroken exterior surface and having inwardly-extending,key-bit-engaging steps and having an inwardly-extendingnotch-accommodating section adapted to have combination notches cut inthe inner portion thereof.

10. A lock tumbler comprising a ring havin an inwardly-extendingnotch-accommodating section adapted to have combination notches cut inthe inner edge thereof, and an inwardly-extending, key-bit-engaging,stair-stepped section 4 positioned diametrically opposite to a portionof said notch section.

FRANK ELLISON BEST.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS 10 Number Name Date 293,885 Jackson Feb. 19, 18842,301,755 Seiffert Nov. 10, 1942 FOREIGN PATENTS 15 Number Country Date381,154 Germany Sept. 1'7, 1923

